Wilhelm lahmetee



2 Shets-Sheet 1.

(No Modei.)

' W. LAHMEYER.

DYNAMO ELECTRIC MACHINE.

Patented Oct. 4, 1887.

l/VVENT I? WITNESSES ATTORNEYS N4 PETERS, Photn-Lilhcgnphnr. Washington, 0. c.

(No Model.)- 2 Sheets-Sheet 2.

W.v LAHMEYER.

- DYNAMO ELECTRIC MACHINE.

No. 370,794. Patented Oct.- 4, 1887.

awn/ 53858: v "IVE/V7011 u. led

A TTORNE Y 6 my invention.

UNITED STATES PATENT OFFICE.

WILHELM LAHMEYER, OF AAGHEN, PRUSSIA, GERMANY.

DYNAMO-ELECTRIC MACHINE.-

SPECIPICATION forming part of Letters Patent No. 370,794, dated October 4-, 1887.

Application filed April 14, 1887. Serial No. 234,773. (No model.) Patented in Belgium November 15, 1886, No. 75,026.

To aZZ whom it may concern: I

Be it known that I, WILHELM LAHMEYER, of Aachen, Prussia, Germany, have invented an Improved Dynamo -Electric Machine, of which the following is a full, clear, and exact description.

The object of my invention is to provide a dynamo-electric machine which will reduce to a minimum the resistance offered to the flow of the electric current by the parts composing the dynamo. I

The invention consists in a dynamo the body, cores, and baseof which are all cast in one'piece of metal in the manner hereinafter described, and in details of construction more fully hereinafter set forth.

Reference is to be had to the accompanying drawings, forming part of this specification, in which- Figure 1 is an end view, part being broken away, of a dynamo constructed according to Fig. 2 is a vertical section taken on line 0 c, Fig. 3, and Fig. 3 is a horizontal section taken on line k In, Fig. 2.

One of the most important points in the construction of the electro magnets of a dynamoelectric machine and their connecting parts, is to so arrange them that a minimum of resistance will be offered to the flow of the electric-current from pole to pole. A great portion of the resistance offered to the current in the dynamo as at present constructed is found in the connections of the various parts of the machine-that is to say, the screws connecting the parts are apt to work loose, thereby separating the parts slightly, causing interruption in the flow of the current, and even the most careful riveting will in time become loosened by and through vibrations and through the constant change from warming and cooling, and especially in damp places the mechanical purity of the joining faces gets lost through rust, 860., and thereby lessens the magnetic intensity. For these reasons I pro pose to form the frame and poles and certain other parts of a dynamo in one piece, preferably of cast-iron.

The followingis the manner in which I construct a dynamo cast in one piece, as above stated.

A, in the drawings, represents the frame of g of the frame A.

E are two coils,which,surrounding the cores D, respectively, make with the cores the electro-magnet. The coils E lie in recesses 6 between the frame A and the cores D. The coils E may either be wound directly on the cores D or they may first be wound in any suitable manner and passed into the cavity B, one by one,between the two cores D, and then slipped over each core and into the recesses e, where they are suitably secured.

Fis the armature, which may be of any suitable construction. The armatureF is passed into the cavity B, and adjusted to revolve between the two faces d-of the electromagnets D E. (See Fig. 2.) The armature F is carried by the shaft f, journaled in the standards a, secured to the base I), and is provided with suitable commutators and conductors. (Best shown in Fig. 1.) The shaft f, carrying the armature F, may be driven in any suitable manner. Suitable air-holes may be made in theframe to conduct the heat from the magnets.

G are perforated iron plates, secured to the ends of the dynamo-frame A, through which the shaft f passes. These plates G help to increase the magnetism of the machine, and also serve to prevent displacement of the movable parts of the machine.

From the above construction it will be seen that I dispense with all joints, pieces, screws, rivets, and connections as ordinarily used for joining the magnets to the frame, thereby giving to the current a continuous and uninterrupted flow, lesseningthe resistance offered to the current, and creating a more intense mag- -netism and stronger current with a given expenditure of power over the ordinary construction.

Having now described my invention, What tnre F, and perforated plates G, substantially 10 I claim isas shown and described.

1. In a dynamo the frame A parallel cores 7 D D, base b, and bridges, yeast in one piece, WILHELM LAHMEYER" 5 of metal, combined with the perforated plates Witnesses:

G, substantially as herein shown and de- T. H. GARBE,

scribed, and for the purposes set forth. Pontdrisch 8, Aachen,

2. The frame A, magnets D, and base b,cast G. EGGERSMANN,

in one piece, combined with the coils E, arma- Pontdrisch 12, Aachen, 

